- static Real note_spacing (Grob *, Grob *, Grob *, Spacing_options const *, bool *);
- static Real get_duration_space (Moment dur, Spacing_options const *, bool *);
- static Rational find_shortest (Grob *, Link_array__Grob_ const &);
- static Rational effective_shortest_duration (Grob *me, Link_array__Grob_ const &all);